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authorLaura Abbott <lauraa@codeaurora.org>2014-07-07 17:45:43 -0700
committerGrant Likely <grant.likely@linaro.org>2014-08-01 12:22:20 -0600
commit3069f0c07f8d64ebf6ff5d2d1553e0a6dad4316e (patch)
tree79cdf807a67f1f710075eb8b99adf1ee18a83084 /drivers/of
parentae9304c9d3111759fed5946272be3b13ba41f7e3 (diff)
downloadop-kernel-dev-3069f0c07f8d64ebf6ff5d2d1553e0a6dad4316e.zip
op-kernel-dev-3069f0c07f8d64ebf6ff5d2d1553e0a6dad4316e.tar.gz
of: Use proper types for checking memory overflow
Commit a67a6ed15513541579d38bcbd127e7be170710e5 (of: Check for phys_addr_t overflows in early_init_dt_add_memory_arch) corrected early_init_dt_add_memory_arch to account for overflows but did so in an unclean way using ULONG_MAX. There is no guarantee that sizeof(unsigned long) == sizeof(phys_addr_t). Check against phys_addr_t instead. Signed-off-by: Laura Abbott <lauraa@codeaurora.org> Tested-by: Geert Uytterhoeven <geert@linux-m68k.org> Acked-by: Nicolas Pitre <nico@linaro.org> Signed-off-by: Grant Likely <grant.likely@linaro.org>
Diffstat (limited to 'drivers/of')
-rw-r--r--drivers/of/fdt.c22
1 files changed, 11 insertions, 11 deletions
diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index b777d8f..b88a68e 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -875,24 +875,24 @@ int __init early_init_dt_scan_chosen(unsigned long node, const char *uname,
}
#ifdef CONFIG_HAVE_MEMBLOCK
+#define MAX_PHYS_ADDR ((phys_addr_t)~0)
+
void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size)
{
const u64 phys_offset = __pa(PAGE_OFFSET);
base &= PAGE_MASK;
size &= PAGE_MASK;
- if (sizeof(phys_addr_t) < sizeof(u64)) {
- if (base > ULONG_MAX) {
- pr_warning("Ignoring memory block 0x%llx - 0x%llx\n",
- base, base + size);
- return;
- }
+ if (base > MAX_PHYS_ADDR) {
+ pr_warning("Ignoring memory block 0x%llx - 0x%llx\n",
+ base, base + size);
+ return;
+ }
- if (base + size > ULONG_MAX) {
- pr_warning("Ignoring memory range 0x%lx - 0x%llx\n",
- ULONG_MAX, base + size);
- size = ULONG_MAX - base;
- }
+ if (base + size > MAX_PHYS_ADDR) {
+ pr_warning("Ignoring memory range 0x%lx - 0x%llx\n",
+ ULONG_MAX, base + size);
+ size = MAX_PHYS_ADDR - base;
}
if (base + size < phys_offset) {
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